Name the heat layer before tile covers it
If a floor will contain an electric heat mat or cables, the proposal should say which trade installs that layer, which trade tests it, and that the test happens before tile covers it. Heat described as something that might be added later is not in the scope. This note does not assign the electrical work to a tile installer and does not describe a wiring method.
The layer is either in or out
A floor designed with a mat has a different thickness and a different order of work from a floor designed without one. The proposal should say heat is included or heat is not included. A footnote that the owner might add heat someday leaves the thinset thickness and the flatness work ambiguous. Decide before the substrate is closed.
Install and test are two owners
The person who lays the mat and the person who tests it may be different trades. Name both. A test that happens after the tile is set can only tell you that a problem is now buried. The scope should put the successful test before the tile covers the wires. The tile sentence then says it begins on a tested layer, not on a coil nobody has checked.
The control and the sensor
The scope should say where the sensor sits and who provides the control, even when the tile installer does neither. Those two parts are how the heat is operated. Omitting them means the mat can be in the floor while the control is still an unowned line. Write them next to the heat line so the assembly is complete on paper.
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